| 单词 | leffel, james |
| 释义 | Leffel, JamesLeffel, James(1806–66) inventor; born in Botetourt County, Va. Taken to Ohio as an infant, he grew up on the frontier and received only intermittent schooling. As a young man he designed, built, and operated a water-powered sawmill near Springfield, Ohio. Over the years he perfected several improved types of waterwheel. He also patented two types of cooking stoves and achieved local fame as a breeder of poultry. |
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